Aging, Social Security Reform and Factor Price in a Transition Economy
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1 Aging, Social Security Reform and Factor Price in a Transition Economy Tomoaki Yamada Rissho University 2, December 2007
2 Motivation Objectives Introduction: Motivation Rapid aging of the population combined with the diminising number of children Tax burden and intergenerational inequality Source of nance Macroeconomic perspective: GDP growth rate Aggregate capital and labor Factor prices (not obvious) Microeconomic perspective: Intragenerational and intergenerational heterogeneity Redistribution, insurance and distortion of social security Idiosyncratic income risk
3 Motivation Objectives Objectives A transition path in Japan from 2000 to 2200 Dynamic stochastic general equilibrium Stationary equilibrium and transition Quantitative analysis [positive and normative] Heterogeneity intergeneratinal intra-cohort Four social security reforms)equilibrium path and welfare Reduction of the replacement rate by half Full privatization Finance by capital income tax Finance by consumption tax
4 Motivation Objectives (1) There is more capital deepening [Benchmark] The equilibrium wage increases by 6% The interest rate decreases by 1.5% Output per capita decreases by 20% because of the decrease in the aggregate capital and labor supply Welfare measured by expected value declines for 50 s Reduction of the replacement rate by half moderates intergenerational inequality
5 Motivation Objectives (2) Introduction of consumption tax may not improve welfare No distortion, but... (i) Redistribution and insurance e ect of social security decline (payroll tax) (ii) Opportunity: labor supply, borrowing constraint and substitution e ect Introducing capital income tax improves welfare of young and future generations Redistribution and insurance e ect
6 An Overlapping Generations Model Policy Experiments Calibration A Model A stochastic overlapping generations model with Idiosyncratic income uncertainty Intergenerational and intragenerational heterogeneity Endogenous labor supply Pay-as-you-go social security system and payroll tax Redistribution e ect of social security Compute transition path
7 An Overlapping Generations Model Policy Experiments Calibration Objective Function A contiuum of households exist. Each household enters labor market at 20, exits at 65, faces mortality risks, can live at most 100: U t = E 20,t ( J j=20! ) β j 1 j 1 φ i,t u(c j,t+j 20, ` `j,t+j 20 ) i=20 c j,t+j 20 : consumption, `j,t+j 20 : labor β : discount factor, φ i,t : survival probability
8 An Overlapping Generations Model Policy Experiments Calibration Budget Constraint Employee: (1 + τ c t )c j,t + a j+1,t+1 y j,t + (1 + (1 τ a t )r t /φ j,t 1 )a j,t, y j,t = (1 τ ss t ) w t η j e j `j,t. Retiree: a j,t : asset holding, y j,t : labor income, τ t : each tax η j : average productivity r t : interest rate, w t : economy-wide wage omit uncertainty about long-living [private annuity market] (1 + τ c t )c j,t + a j+1,t+1 w t b(τ ss t, W g,t ) + (1 + (1 τ a t )r t /φ j,t 1 )a j,t, b(τ ss t, W g,t ) : replacement rate, W g,t : trust fund
9 An Overlapping Generations Model Policy Experiments Calibration Earnings Risk Three components of income shocks Fixed e ect Persistent shock Transitory shock Match the variance pro le of log-earnings Figure 1
10 Figure 1: Variance Profiles Variance of Logarithm of Income Profile cross cectional Variance age data simulation Variance of Logarithm of Consumption Profile cross cectional variance age data simulation
11 An Overlapping Generations Model Policy Experiments Calibration Behavior of Firms Production function Aggregation K t = L t = Y t = A t K θ t L 1 J Z µ j,t j=20 j r Z µ j,t j=20 t θ, a j,t dφ t (a j, e j ) + W g,t, η j e j `j,t dφ t (a j, e j ). Φ t (a j, e j ) : distribution function µ t : the population distribution in period t Factor prices r t = θa t (K t /L t ) θ 1 δ, w t = (1 θ)a t (K t /L t ) θ,
12 An Overlapping Generations Model Policy Experiments Calibration PAYG Social Security System The government s budget constraint W g,t+1 = (1 + r t )W g,t + (T SS t + T C t + T A t ) B t, Revenue and Bene ts Tt SS Tt C Tt A : payroll tax : consumption tax : capital income tax B t : social security bene t
13 An Overlapping Generations Model Policy Experiments Calibration De nition of Recursive Competitive Equilibrium Recursive Competitive Equilibrium consists of Household s optimality Firm s optimality Market clearing Government s budget Transition law of motion Detrend by population growth rate and TFP growth rate
14 An Overlapping Generations Model Policy Experiments Calibration Four Policy Experiments A Benchmark: use medium variant of the population projection by the National Institute of Population and Social Security Research The replacement rate is targeted at 50% 1 Social security reform I: reduction of the replacement rate by half for 50 s 2 Social security reform II: (almost) full privatization for 50 s 3 The other source of nance I: capital income tax set at 30% (2001) 4 The other source of nance II: consumption tax set at 5% (2001)
15 An Overlapping Generations Model Policy Experiments Calibration Calibration: Fundamental Parameters Set initial stationary state in 2000 Survival probability from Life Table (NIPSSR) Instantaneous utility function i 1 γ hcj,t σ ( ` `j,t ) 1 σ u c j,t, ` `j,t = β = 0.985, γ = 2, σ = 0.38 Replacement rate: 50% of average earnings Production parameters 1 θ = 0.312, δ = 0.089, A 1 θ t+1 /A 1 t 1 θ 1 γ = 1.01(8t).
16 An Overlapping Generations Model Policy Experiments Calibration Demographic Structure We consider the transition path from 2000 to Use the NIPSSR(2002) s projection from 2001 to 2050 Three variants of projection Medium variant [Benchmark] High variant Low variant Converge to zero population growth (new stationary state) population distribution converges to stationary state in 2160
17 Figure 2: Population Dynamics in Japan population (1,000) (a) Population Distribution in age (c) Population Dynamics: Medium Variant population (b) Population Dynamics: Low Variant (d)population Dynamics: High Variant population population
18 Stationary State Analysis Transition Paths and Welfare Conclusion : Stationary State Macroeconomic variables in 2000 as targets K /Y = 2.42, r + 4.0% SS in 2000 ) SS in 2200 K /Y increases by 3.11% the interest rate decreases by 39 basis points Benchmark ) Capital Income Tax by 30% remaining payroll tax rate+ 5% labor supply increases ch(l)6=ch(h) Benchmark ) Consumption Tax by 5% remaining payroll tax rate+ 5% labor supply decreases
19 Stationary State Analysis Transition Paths and Welfare Conclusion Stationary Equilibrium (Table 3&4) Medium Rep. Rate Tax Reform Year Variant 25% 0.1% cons. cap K /Y ch(k /Y ): % r (%) w τ ss (%) K /N L/N ch(l/n): % ch(hours): % Y /N
20 Stationary State Analysis Transition Paths and Welfare Conclusion Stationary Equilibrium (Table 3) Medium Rep. Rate Tax Reform Variant 25% 0.1% cons. cap. Gini (20-100) Gini (30-65) Gini (20s) Gini (30s) Gini (40s) Gini (50s) Gini (60s)
21 Stationary State Analysis Transition Paths and Welfare Conclusion Closed Economy Welfare Criteria: Ev t (a 20, s 20 ) = π(s)v t (0, s 20 ), EV (a 20, s 20 ) = Ev Reform t (a 20, s 20 ) σ(1 γ). Evt Bench (a 20, s 20 ) Cohort s value and consumption equivalent Benchmark The cohort s welfare decreases for the aging period of 50 s and reaches the lowest point around 2050 Introducing capital income tax improves welfare of current young and future generations Introducing consumption tax does not improves welfare Figure 8
22 expected value Figure 8: Welfare Comparison (Cohort at Age 20) benchmark ss reform I ss reform II cap. tax con. tax
23 Figure 8: Welfare Comparison (EV) EV benchmark ss reform I ss reform II cap. tax con. tax
24 Stationary State Analysis Transition Paths and Welfare Conclusion Small Open Economy Lessons from Attanasio, Kitao, and Violante (2007) Equilibrium payroll tax rate does not change so much Welfare implication changes Introducing capital income tax improves welfare more Figure 9
25 expected value Figure 9: Welfare Comparison (Cohort at Age 20) benchmark ss reform I ss reform II cap. tax con. tax
26 Figure 9: Welfare Comparison (EV) EV benchmark ss reform I ss reform II cap. tax con. tax
27 Stationary State Analysis Transition Paths and Welfare Conclusion What causes the di erences? Consumption tax improves welfare: e.g. Tachibanaki et al. (2006) Intragenerational heterogeneity Borrowing constraint Introducing consumption tax does not necessarily improve welfare of the economy: Nishiyama and Smetters (2005,JPE) with/without intragenerational heterogeneity redistribution and insurance e ect of social security system Insurance or Opportunity?: Heathcote, Storesletten, and Violante (2005,JME) The social security o ers insurance for life-time income Concentration of labor supply at high productivity (covariance of hourly wage and work hours)
28 Stationary State Analysis Transition Paths and Welfare Conclusion A Benchmark Case, SSR I & II A Benchmark Case The equilibrium interest rate decrease The equilibrium wage increase up to 5% The payroll tax rate increases up to 18% Output per capita decreases by 20% SSR I (Reduction by Half) The wage level increases by 10% The payroll tax rate does not exceed 12% Output per capita is atter than in the benchmark case SSR II (Full Privatization) The real return on capital becomes negative The equilibrium wage rises over 20%
29 Figure 3: Benchmark Case (Medium Variant) interest rate 4.5% 4.0% 3.5% 3.0% 2.5% 2.0% Factor Prices % % % % 0.97 wage replacement rate Social Security System 60% 25% 50% 20% 40% 30% 20% 10% 0% 15% 10% 5% 0% payroll tax rate interest rate wage replacement rate payroll tax rate Capital and Labor: Population Adjusted (K, L) Output Per Capita capital (K/N) capital labor labor (L/N) output
30 Figure 4: Social Security Reform I (25%) interest rate 4.5% 4.0% 3.5% 3.0% 2.5% 2.0% Factor Prices % % % % 0.94 wage replacement rate Social Security System 60% 25% 50% 20% 40% 30% 20% 10% 0% 15% 10% 5% 0% payroll tax rate interest rate wage replacement rate payroll tax rate Capital and Labor: Population Adjusted (K, L) Output Per Capita capital (K/N) capital labor labor (L/N) output
31 Figure 5: Social Security Reform II (0.1%) interest rate Factor Prices 4.5% % 3.5% % % % 1.5% % % 0.0% % 0.90 wage replacement rate Social Security System 60% 25% 50% 20% 40% 30% 20% 10% 0% 15% 10% 5% 0% payroll tax rate interest rate wage replacement rate payroll tax rate capital (K/N) Capital and Labor: Population Adjusted (K, L) capital labor labor (L/N) output Output Per Capita
32 Stationary State Analysis Transition Paths and Welfare Conclusion Capital Income Tax and Consumption Tax Capital Income Tax Dynamic ine ciency?(abel, et al. (1989) Over-accumulation with precautionary saving?(aiyagari (1995) Labor supply incentive?(conesa and Krueger (2006) The maximum payroll tax rate does not exceed 16% Relatively small e ect on the factor prices path Per capita output is large relative to the benchmark case Consumption Tax Factor price pathes are similar to the benchmark case The maximum payroll tax does not exceed 14%
33 Figure 6: Capital Income Tax interest rate 4.5% 4.0% 3.5% 3.0% 2.5% 2.0% Factor Prices % % % % 0.97 wage replacement rate Social Security System 60% 25% 50% 20% 40% 30% 20% 10% 0% 15% 10% 5% 0% payroll tax rate interest rate wage replacement rate payroll tax rate Capital and Labor: Population Adjusted (K, L) Output Per Capita capital (K/N) capital labor labor (L/N) output
34 Figure 7: Consumption Tax interest rate 4.5% 4.0% 3.5% 3.0% 2.5% 2.0% Factor Prices % % % % 0.97 wage replacement rate Social Security System 60% 25% 50% 20% 40% 30% 20% 10% 0% 15% 10% 5% 0% payroll tax rate interest rate wage replacement rate payroll tax rate Capital and Labor: Population Adjusted (K, L) Output Per Capita capital (K/N) capital labor labor (L/N) output
35 Stationary State Analysis Transition Paths and Welfare Conclusion Conclusion Capital income tax weakly improves the young and future generations welfare Consumption tax should not necessarily improves the welfare because of Heterogeneity Redistribution e ect of social security Labor supply incentives Partial privatization will improves the welfare of future cohorts How to incorporate aggregate risk? Intergenerational risk sharing by a social security system (Krueger and Kubler, 2005 AER) Demographic risk
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